Phys. Rev. D
65,
052008
(2002)
[20 pages]
Subjet multiplicity of gluon and quark jets reconstructed with the k⊥ algorithm in pp̅ collisions
V. M. Abazov et al. (DØ Collaboration)
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V. M. Abazov23, B. Abbott57, A. Abdesselam11, M. Abolins50, V. Abramov26, B. S. Acharya17, D. L. Adams59, M. Adams37, S. N. Ahmed21, G. D. Alexeev23, A. Alton49, G. A. Alves2, N. Amos49, E. W. Anderson42, Y. Arnoud9, C. Avila5, M. M. Baarmand54, V. V. Babintsev26, L. Babukhadia54, T. C. Bacon28, A. Baden46, B. Baldin36, P. W. Balm20, S. Banerjee17, E. Barberis30, P. Baringer43, J. Barreto2, J. F. Bartlett36, U. Bassler12, D. Bauer28, A. Bean43, F. Beaudette11, M. Begel53, A. Belyaev35, S. B. Beri15, G. Bernardi12, I. Bertram27, A. Besson9, R. Beuselinck28, V. A. Bezzubov26, P. C. Bhat36, V. Bhatnagar11, M. Bhattacharjee54, G. Blazey38, F. Blekman20, S. Blessing35, A. Boehnlein36, N. I. Bojko26, F. Borcherding36, K. Bos20, T. Bose52, A. Brandt59, R. Breedon31, G. Briskin58, R. Brock50, G. Brooijmans36, A. Bross36, D. Buchholz39, M. Buehler37, V. Buescher14, V. S. Burtovoi26, J. M. Butler47, F. Canelli53, W. Carvalho3, D. Casey50, Z. Casilum54, H. Castilla-Valdez19, D. Chakraborty38, K. M. Chan53, S. V. Chekulaev26, D. K. Cho53, S. Choi34, S. Chopra55, J. H. Christenson36, M. Chung37, D. Claes51, A. R. Clark30, J. Cochran34, L. Coney41, B. Connolly35, W. E. Cooper36, D. Coppage43, S. Crépé-Renaudin9, M. A. C. Cummings38, D. Cutts58, G. A. Davis53, K. Davis29, K. De59, S. J. de Jong21, K. Del Signore49, M. Demarteau36, R. Demina44, P. Demine9, D. Denisov36, S. P. Denisov26, S. Desai54, H. T. Diehl36, M. Diesburg36, S. Doulas48, Y. Ducros13, L. V. Dudko25, S. Duensing21, L. Duflot11, S. R. Dugad17, A. Duperrin10, A. Dyshkant38, D. Edmunds50, J. Ellison34, V. D. Elvira36, R. Engelmann54, S. Eno46, G. Eppley61, P. Ermolov25, O. V. Eroshin26, J. Estrada53, H. Evans52, V. N. Evdokimov26, T. Fahland33, S. Feher36, D. Fein29, T. Ferbel53, F. Filthaut21, H. E. Fisk36, Y. Fisyak55, E. Flattum36, F. Fleuret12, M. Fortner38, H. Fox39, K. C. Frame50, S. Fu52, S. Fuess36, E. Gallas36, A. N. Galyaev26, M. Gao52, V. Gavrilov24, R. J. Genik, II27, K. Genser36, C. E. Gerber37, Y. Gershtein58, R. Gilmartin35, G. Ginther53, B. Gómez5, G. Gómez46, P. I. Goncharov26, J. L. González Solís19, H. Gordon55, L. T. Goss60, K. Gounder36, A. Goussiou28, N. Graf55, G. Graham46, P. D. Grannis54, J. A. Green42, H. Greenlee36, Z. D. Greenwood45, S. Grinstein1, L. Groer52, S. Grünendahl36, A. Gupta17, S. N. Gurzhiev26, G. Gutierrez36, P. Gutierrez57, N. J. Hadley46, H. Haggerty36, S. Hagopian35, V. Hagopian35, R. E. Hall32, P. Hanlet48, S. Hansen36, J. M. Hauptman42, C. Hays52, C. Hebert43, D. Hedin38, J. M. Heinmiller37, A. P. Heinson34, U. Heintz47, T. Heuring35, M. D. Hildreth41, R. Hirosky62, J. D. Hobbs54, B. Hoeneisen8, Y. Huang49, R. Illingworth28, A. S. Ito36, M. Jaffré11, S. Jain17, R. Jesik28, K. Johns29, M. Johnson36, A. Jonckheere36, H. Jöstlein36, A. Juste36, W. Kahl44, S. Kahn55, E. Kajfasz10, A. M. Kalinin23, D. Karmanov25, D. Karmgard41, R. Kehoe50, A. Khanov44, A. Kharchilava41, S. K. Kim18, B. Klima36, B. Knuteson30, W. Ko31, J. M. Kohli15, A. V. Kostritskiy26, J. Kotcher55, B. Kothari52, A. V. Kotwal52, A. V. Kozelov26, E. A. Kozlovsky26, J. Krane42, M. R. Krishnaswamy17, P. Krivkova6, S. Krzywdzinski36, M. Kubantsev44, S. Kuleshov24, Y. Kulik54, S. Kunori46, A. Kupco7, V. E. Kuznetsov34, G. Landsberg58, W. M. Lee35, A. Leflat25, C. Leggett30, F. Lehner36, J. Li59, Q. Z. Li36, X. Li4, J. G. R. Lima3, D. Lincoln36, S. L. Linn35, J. Linnemann50, R. Lipton36, A. Lucotte9, L. Lueking36, C. Lundstedt51, C. Luo40, A. K. A. Maciel38, R. J. Madaras30, V. L. Malyshev23, V. Manankov25, H. S. Mao4, T. Marshall40, M. I. Martin38, K. M. Mauritz42, B. May39, A. A. Mayorov40, R. McCarthy54, T. McMahon56, H. L. Melanson36, M. Merkin25, K. W. Merritt36, C. Miao58, H. Miettinen61, D. Mihalcea38, C. S. Mishra36, N. Mokhov36, N. K. Mondal17, H. E. Montgomery36, R. W. Moore50, M. Mostafa1, H. da Motta2, E. Nagy10, F. Nang29, M. Narain47, V. S. Narasimham17, N. A. Naumann21, H. A. Neal49, J. P. Negret5, S. Negroni10, T. Nunnemann36, D. O’Neil50, V. Oguri3, B. Olivier12, N. Oshima36, P. Padley61, L. J. Pan39, K. Papageorgiou37, A. Para36, N. Parashar48, R. Partridge58, N. Parua54, M. Paterno53, A. Patwa54, B. Pawlik22, J. Perkins59, O. Peters20, P. Pétroff11, R. Piegaia1, B. G. Pope50, E. Popkov47, H. B. Prosper35, S. Protopopescu55, M. B. Przybycien39, J. Qian49, R. Raja36, S. Rajagopalan55, E. Ramberg36, P. A. Rapidis36, N. W. Reay44, S. Reucroft48, M. Ridel11, M. Rijssenbeek54, F. Rizatdinova44, T. Rockwell50, M. Roco36, C. Royon13, P. Rubinov36, R. Ruchti41, J. Rutherfoord29, B. M. Sabirov23, G. Sajot9, A. Santoro2, L. Sawyer45, R. D. Schamberger54, H. Schellman39, A. Schwartzman1, N. Sen61, E. Shabalina37, R. K. Shivpuri16, D. Shpakov48, M. Shupe29, R. A. Sidwell44, V. Simak7, H. Singh34, J. B. Singh15, V. Sirotenko36, P. Slattery53, E. Smith57, R. P. Smith36, R. Snihur39, G. R. Snow51, J. Snow56, S. Snyder55, J. Solomon37, Y. Song59, V. Sorín1, M. Sosebee59, N. Sotnikova25, K. Soustruznik6, M. Souza2, N. R. Stanton44, G. Steinbrück52, R. W. Stephens59, F. Stichelbaut55, D. Stoker33, V. Stolin24, A. Stone45, D. A. Stoyanova26, M. A. Strang59, M. Strauss57, M. Strovink30, L. Stutte36, A. Sznajder3, M. Talby10, W. Taylor54, S. Tentindo-Repond35, S. M. Tripathi31, T. G. Trippe30, A. S. Turcot55, P. M. Tuts52, V. Vaniev26, R. Van Kooten40, N. Varelas37, L. S. Vertogradov23, F. Villeneuve-Seguier10, A. A. Volkov26, A. P. Vorobiev26, H. D. Wahl35, H. Wang39, Z.-M. Wang54, J. Warchol41, G. Watts63, M. Wayne41, H. Weerts50, A. White59, J. T. White60, D. Whiteson30, J. A. Wightman42, D. A. Wijngaarden21, S. Willis38, S. J. Wimpenny34, J. Womersley36, D. R. Wood48, Q. Xu49, R. Yamada36, P. Yamin55, T. Yasuda36, Y . A. Yatsunenko23, K. Yip55, S. Youssef35, J. Yu36, Z. Yu39, M. Zanabria5, X. Zhang57, H. Zheng41, B. Zhou49, Z. Zhou42, M. Zielinski53, D. Zieminska40, A. Zieminski40, V. Zutshi55, E. G. Zverev25, and A. Zylberstejn13 (DØ Collaboration)
1Universidad de Buenos Aires, Buenos Aires, Argentina
2LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
3Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
4Institute of High Energy Physics, Beijing, People’s Republic of China
5Universidad de los Andes, Bogotá, Colombia
6Charles University, Center for Particle Physics, Prague, Czech Republic
7Institute of Physics, Academy of Sciences, Center for Particle Physics, Prague, Czech Republic
8Universidad San Francisco de Quito, Quito, Ecuador
9Institut des Sciences Nucléaires, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
10CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France
11Laboratoire de l’Accélérateur Linéaire, IN2P3-CNRS, Orsay, France
12LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France
13DAPNIA/Service de Physique des Particules, CEA, Saclay, France
14Universität Mainz, Institut für Physik, Mainz, Germany
15Panjab University, Chandigarh, India
16Delhi University, Delhi, India
17Tata Institute of Fundamental Research, Mumbai, India
18Seoul National University, Seoul, Korea
19CINVESTAV, Mexico City, Mexico
20FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
21University of Nijmegen/NIKHEF, Nijmegen, The Netherlands
22Institute of Nuclear Physics, Kraków, Poland
23Joint Institute for Nuclear Research, Dubna, Russia
24Institute for Theoretical and Experimental Physics, Moscow, Russia
25Moscow State University, Moscow, Russia
26Institute for High Energy Physics, Protvino, Russia
27Lancaster University, Lancaster, United Kingdom
28Imperial College, London, United Kingdom
29University of Arizona, Tucson, Arizona 85721
30Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720
31University of California, Davis, California 95616
32California State University, Fresno, California 93740
33University of California, Irvine, California 92697
34University of California, Riverside, California 92521
35Florida State University, Tallahassee, Florida 32306
36Fermi National Accelerator Laboratory, Batavia, Illinois 60510
37University of Illinois at Chicago, Chicago, Illinois 60607
38Northern Illinois University, DeKalb, Illinois 60115
39Northwestern University, Evanston, Illinois 60208
40Indiana University, Bloomington, Indiana 47405
41University of Notre Dame, Notre Dame, Indiana 46556
42Iowa State University, Ames, Iowa 50011
43University of Kansas, Lawrence, Kansas 66045
44Kansas State University, Manhattan, Kansas 66506
45Louisiana Tech University, Ruston, Louisiana 71272
46University of Maryland, College Park, Maryland 20742
47Boston University, Boston, Massachusetts 02215
48Northeastern University, Boston, Massachusetts 02115
49University of Michigan, Ann Arbor, Michigan 48109
50Michigan State University, East Lansing, Michigan 48824
51University of Nebraska, Lincoln, Nebraska 68588
52Columbia University, New York, New York 10027
53University of Rochester, Rochester, New York 14627
54State University of New York, Stony Brook, New York 11794
55Brookhaven National Laboratory, Upton, New York 11973
56Langston University, Langston, Oklahoma 73050
57University of Oklahoma, Norman, Oklahoma 73019
58Brown University, Providence, Rhode Island 02912
59University of Texas, Arlington, Texas 76019
60Texas A&M University, College Station, Texas 77843
61Rice University, Houston, Texas 77005
62University of Virginia, Charlottesville, Virginia 22901
63University of Washington, Seattle, Washington 98195
Received 4 September 2001; published 7 February 2002
The DØ Collaboration has studied for the first time the properties of hadron-collider jets reconstructed with a successive-combination algorithm based on relative transverse momenta (k⊥) of energy clusters. Using the standard value D=1.0 of the jet-separation parameter in the k⊥ algorithm, we find that the pT of such jets is higher than the ET of matched jets reconstructed with cones of radius R=0.7, by about 5 (8) GeV at pT≈90 (240) GeV. To examine internal jet structure, the k⊥ algorithm is applied within D=0.5 jets to resolve any subjets. The multiplicity of subjets in jet samples at √s=1800 GeV and 630 GeV is extracted separately for gluons (Mg) and quarks (Mq), and the ratio of average subjet multiplicities in gluon and quark jets is measured as (〈Mg〉-1)/(〈Mq〉-1)=1.84±0.15 (stat)±0.180.22 (syst). This ratio is in agreement with the expectations from the HERWIG Monte Carlo event generator and a resummation calculation, and with observations in e+e- annihilations, and is close to the naive prediction for the ratio of color charges of CA/CF=9/4=2.25.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.65.052008
DOI:
10.1103/PhysRevD.65.052008
PACS:
13.87.Ce, 12.38.Qk, 14.65.Bt, 14.70.Dj
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